Half time: notice the snare moves to beats 3 of measure one and two (beats 3 & 7) while the hi-hat plays only on the quarter notes. Note also, for example, that the quarter notes 'sound like' eighth notes in one giant measure.
Bach, Sinfonia in F minor BWV 795, mm. 1-3. Created by Hyacinth (talk) 22:19, 17 April 2010 using Sibelius 5. See: :Image:Bach,_Sinfonia_in_F_minor_BWV_795,_mm._1-3a.png
Author: The original uploader was Hyacinth at English Wikipedia.